Apparatus for the heat-sealing thermoplastic conduits with a bri

Details Apparatus for the heat-sealing thermoplastic conduits with a bri Apparatus for the heat-sealing thermoplastic conduits with a bri

1984-02-02

1986-10-21

Husar, Cornelius J.

Pipe joints or couplings

With assembly means or feature

Molded joint facilitator

219535, 219544, 219499, 219517, 264230, 156294, 1563797, 1562739, 1563043, 1563046, F16L 4702

Patent

active

046181687

ABSTRACT:
A system for heat-sealing thermoplastic conduits involves a thermoplastic sleeve surrounding an electrically conductive heating wire arranged in a coil. A bridging conductor is located adjacent the heating element, but is separated from it by an insulation layer of predetermined thickness. When the sleeve is heated by supplying electric power to the heating element, the entire heating element generates heat during a first phase in which fusion pressure is applied between the sleeve and pipes being connected. The bridging connector is forced into contact with selected coils of the heating element to initiate a second phase. In the second phase, the heat produced in the area of the selected coils is automatically reduced by short circuiting such coils.

REFERENCES:
patent: 3378672 (1968-04-01), Blumenkranz
patent: 3506519 (1970-04-01), Blumenkranz
patent: 4096017 (1978-06-01), Wyke
patent: 4224505 (1980-09-01), Sturm
patent: 4455482 (1984-06-01), Grandclement
patent: 4486650 (1984-12-01), Bridgstock
patent: 4493985 (1985-01-01), Keller
patent: 4530521 (1985-07-01), Nyffeler
patent: 4536644 (1985-08-01), Thalmann

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